/Engine/Source/Runtime/AudioMixer/Public/SoundWaveDecoder.h
Get a decoded buffer for the given decoding sound wave handle. Call only from audio render thread or audio render thread task.
bool GetSourceBuffer ( const [FDecodingSoundSourceHandle](API\Runtime\AudioMixer\FDecodingSoundSourceHandle) & InHandle, const int32 NumOutFrames, const int32 NumOutChannels, [FAlignedFloatBuffer](API\Runtime\SignalProcessing\DSP\FAlignedFloatBuffer) & OutAudioBuffer )